Personally I think a couple of other technologies in this space are probably more interesting -- RFID\'s, lower cost and are currently being tested by Walmart, Target for product tracking; Electronic paper replacements like E-ink\'s technology (flat piece of plastic that can be rolled up and yet is a fully erasable display); Phone/PDA devices with IRDA and Wi-Fi interfaces (universal control/communication device). That being said I\'m sure people will find some more uses for smart paper than electronic greeting cards.